I think the Walt showed an uncharacteristic lack of judgement. What did he think that Jesse was bringing him out to the desert for? If he wanted to burn the money he would have just done it, if he wanted to talk to Walt he already had an opportunity. It was an obvious trap. Also the fact that Walt had the whole drive to think about it and it never crossed his mind that this might not be such a great idea. It felt a little forced to me.

I guess keep in mind that to Walt it was IMPOSSIBLE that Jesse would be setting him up in some way or that Jesse was working with Hank. Even when he asked Uncle Jack to kill Jesse, Walt said that Jesse wasn't a rat.